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%%
%% %CopyrightBegin%
%%
%% Copyright Ericsson AB 2004-2016. All Rights Reserved.
%%
%% Licensed under the Apache License, Version 2.0 (the "License");
%% you may not use this file except in compliance with the License.
%% You may obtain a copy of the License at
%%
%% http://www.apache.org/licenses/LICENSE-2.0
%%
%% Unless required by applicable law or agreed to in writing, software
%% distributed under the License is distributed on an "AS IS" BASIS,
%% WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
%% See the License for the specific language governing permissions and
%% limitations under the License.
%%
%% %CopyrightEnd%
%%
%%% Description : Callback module for exporting XHTML to OTP-SGML.
-module(xmerl_otpsgml).
-export(['#xml-inheritance#'/0]).
%% Note: we assume XML data, so all tags are lowercase!
-export(['#root#'/4,
'#element#'/5,
'#text#'/1,
p/4]).
-import(xmerl_lib, [markup/3, start_tag/2, is_empty_data/1,
export_text/1]).
-include("xmerl.hrl").
-include("xmerl_internal.hrl").
'#xml-inheritance#'() -> [xmerl_sgml].
%% The '#text#' function is called for every text segment.
'#text#'(Text) ->
export_text(Text).
%% The '#root#' tag is called when the entire structure has been
%% exported. It does not appear in the structure itself.
'#root#'(Data, _Attrs, [], _E) ->
["<!doctype erlref PUBLIC \"-//Stork//DTD erlref//EN\">\n",Data].
%% Note that SGML does not have the <Tag/> empty-element form.
%% Furthermore, for some element types, the end tag is forbidden. (In
%% all other cases, we always generate the end tag, to make sure that
%% the scope of a markup is not extended by mistake.)
'#element#'(Tag, Data, Attrs, _Parents, _E) ->
% ?dbg("parents:\n~p\n",[_Parents]),
case convert_tag(Tag,Attrs) of
{false,NewTag,NewAttrs} ->
markup(NewTag, NewAttrs, Data);
{true,NewTag,NewAttrs} ->
[start_tag(NewTag, NewAttrs), Data]
end.
%% HTML tags with special handling
p(Data, Attrs, _Parents, _E) ->
%% In general, we cannot drop the end tag for paragraph elements;
%% that is only allowed if we know that it is immediately followed
%% by some other block-level tag.
case is_empty_data(Data) of
true ->
%% Paragraph elements should never be completely empty.
markup(p, Attrs, "\s");
false ->
markup(p, Attrs, Data)
end.
%% Utility functions
convert_tag(code,Attrs) -> convert_tag(c,Attrs);
convert_tag(strong,Attrs) -> convert_tag(em,Attrs);
convert_tag(b,Attrs) -> convert_tag(em,Attrs);
convert_tag(underline,Attrs) -> convert_tag(em,Attrs); % what is underline in sgml???
convert_tag(dl,Attrs) -> convert_tag(taglist,Attrs);
convert_tag(dt,Attrs) -> convert_tag(tag,Attrs);
convert_tag(dd,Attrs) -> convert_tag(item,Attrs);
convert_tag(ul,Attrs) -> convert_tag(list,Attrs);
convert_tag(li,Attrs) -> convert_tag(item,Attrs);
convert_tag(tt,Attrs) -> convert_tag(c,Attrs);
%convert_tag(a, Attrs) -> convert_tag(seealso,convert_seealso_attrs(Attrs));
convert_tag(a, Attrs) -> convert_tag(convert_aref(Attrs),convert_aref_attrs(convert_aref(Attrs),Attrs));
convert_tag(Tag,Attrs) -> {forbid_end(Tag),Tag,Attrs}.
convert_aref([#xmlAttribute{name = href, value = V}|_Rest]) ->
%% search if it is a html link, thus make it a 'url' ref otherwise
%% a 'seealso'.
case html_content(V) of
true ->
url;
_ ->
seealso
end;
convert_aref([#xmlAttribute{name = K}|Rest]) ->
error_logger:warning_msg("ignoring attribute \'~p\' for tag \'a\'\n",[K]),
convert_aref(Rest).
convert_aref_attrs(url,Attrs) ->
Attrs;
convert_aref_attrs(SA,[#xmlAttribute{name = href, value = V}=A|Rest]) ->
[A#xmlAttribute{name=marker,value=V}|convert_aref_attrs(SA,Rest)];
convert_aref_attrs(_,[])->
[].
html_content([]) ->
false;
html_content([$.|Rest]) ->
case Rest of
"htm"++_EmaNfeR ->
true;
_ -> html_content(Rest)
end;
html_content([_H|T]) ->
html_content(T).
% convert_seealso_attrs([#xmlAttribute{name = href, value = V} = A|Rest]) ->
% [A#xmlAttribute{name=marker,value=normalize_web_ref(V)}|convert_seealso_attrs(Rest)];
% convert_seealso_attrs([#xmlAttribute{name = K}|Rest]) ->
% error_logger:warning_msg("ignoring attribute \'~p\' for tag \'a\'\n",[K]),
% convert_seealso_attrs(Rest);
% convert_seealso_attrs([]) ->
% [].
% normalize_web_ref(RefName) ->
% normalize_web_ref1(lists:reverse(RefName)).
% normalize_web_ref1("lmth."++EmaNfeR) ->
% lists:reverse(EmaNfeR);
% normalize_web_ref1("mth"++EmaNfeR) ->
% lists:reverse(EmaNfeR);
% normalize_web_ref1(RefName) ->
% RefName.
forbid_end(area) -> true;
forbid_end(base) -> true;
forbid_end(basefont) -> true;
forbid_end(br) -> true;
forbid_end(col) -> true;
forbid_end(frame) -> true;
forbid_end(hr) -> true;
forbid_end(img) -> true;
forbid_end(input) -> true;
forbid_end(isindex) -> true;
forbid_end(link) -> true;
forbid_end(marker) -> true;
forbid_end(meta) -> true;
forbid_end(param) -> true;
forbid_end(_) -> false.
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